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Accurate samples and unbiased results

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How can we be certain that surveys and statistics that we hear about in the media are accurate samples and unbiased? Is there a way to dissect the information and determine if a probability sample was used?

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Accurate samples and unbiased results are examined.

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The media outlet will usually say that a "scientific" sample was used for the analysis. Another characterization would be "random" sample. If the poll or survey utilizes a "random" or "scientific" ...

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